Búsqueda Imágenes Maps Play YouTube Noticias Gmail Drive Más »
Iniciar sesión
Usuarios de lectores de pantalla: deben hacer clic en este enlace para utilizar el modo de accesibilidad. Este modo tiene las mismas funciones esenciales pero funciona mejor con el lector.

Patentes

  1. Búsqueda avanzada de patentes
Número de publicaciónUS5300764 A
Tipo de publicaciónConcesión
Número de solicitudUS 07/826,337
Fecha de publicación5 Abr 1994
Fecha de presentación27 Ene 1992
Fecha de prioridad11 Sep 1991
TarifaPagadas
También publicado comoDE69227873D1, DE69227873T2, EP0531605A1, EP0531605B1
Número de publicación07826337, 826337, US 5300764 A, US 5300764A, US-A-5300764, US5300764 A, US5300764A
InventoresHidekazu Hoshino, Itsuo Takeuchi
Cesionario originalNhk Spring Company, Ltd.
Exportar citaBiBTeX, EndNote, RefMan
Enlaces externos: USPTO, Cesión de USPTO, Espacenet
Transparent optical identification label with infrared directivity
US 5300764 A
Resumen
An optical identification label consisting of an area of hologram or diffraction grating which is transparent to visible light but reflects incident light with a specific reflective directivity. By identifying the reflectivity directivity, it is possible to identify the authenticity of the label and, hence, the object to which the identification label is affixed. The fact that the identification label is transparent to human eyes offers a strong discouraging effect on potential forgers. Further, the pattern of the reflected light may be used as means for encoding data.
Imágenes(4)
Previous page
Next page
Reclamaciones(6)
What is claimed is:
1. A transparent optical identification label, comprising a reflective layer which transmits visible light but reflects light of a certain wavelength other than visible light with a specific directivity that can be identified with optical identifying means.
2. A transparent optical identification label according to claim 1, wherein said reflective directivity is given by hologram.
3. A transparent optical identification label according to claim 1, wherein said reflective directivity is given by diffraction grating.
4. A transparent optical identification label according to claim 1, wherein said reflective layer consists of alternating layers of at least two kinds of different materials having different refractive indices.
5. A transparent optical identification label according to claim 1, wherein said identification label is affixed to an object as means for preventing an unauthorized duplication of said object.
6. A transparent optical identification label according to claim 1, wherein data is encoded in a geometrical pattern of said reflected light.
Descripción
TECHNICAL FIELD

The present invention relates to an optical identification label which is transparent to human eyes but has a specific optical property which can be identified with optical means.

BACKGROUND OF THE INVENTION

Conventionally is known the structure in which hologram which is difficult to duplicate is affixed as an identification label to objects such as magnetic cards and other information storage cards, stocks and bonds, tickets, and other commercial goods to identify their authenticity, and such a label is disclosed, for instance, in Japanese utility model laid-open publication (kokai) No. 61-182580.

However, such an identification label is necessarily affixed to a location which can be readily and visually identified because it is required to be visually identified. Therefore, the freedom of the design of the object tends to be reduced because the position, shape and color of the identification label must be considered as a part of the design, and the external appearance of the object may be seriously impaired because of the failure to achieve an acceptable design balance.

According to the disclosure of Japanese patent laid-open publication (kokai) No. 3-71383 by the applicant of this patent application, a hologram area having a unique diffraction property is provided on the surface of an object, and this hologram area is identified with an identification unit serving as optical identification means. By using this structure, since the object consists of an object having a fixed shape, such as information storage cards, stocks and bonds, and tickets, and the identification process is carried out by the identification unit, it is possible to place an identification label at an inconspicuous location on the object and to improve the freedom in the design of the object, but the very existence of the identification label on the surface of the object could not totally eliminate the restriction on the design of the object.

Meanwhile, as for the system in which the identification process is carried out with a machine, since the operator is not required to heed the location at which the identification label is placed, it is preferable to make the visual recognition of the existence of the identification label difficult as much as possible to the end of discouraging any attempt to duplicate the identification label with an fraudulent intent.

BRIEF SUMMARY OF THE INVENTION

In view of such problems of the prior art, a primary object of the present invention is to provide an optical identification label which would not affect the external appearance of the object to which the label is affixed.

A second object of the present invention is to provide an optical identification label which is difficult to fabricate for potential forgers.

A third object of the present invention is to provide an optical identification label which ensures accurate and reliable identification.

These and other objects of the present invention can be accomplished by providing a transparent optical identification label, comprising a reflective layer which transmits visible light but reflects light of a certain wavelength other than visible light with a specific directivity that can be identified with optical identifying means. Such a reflective directivity may be produced by using hologram or diffraction grating.

Also, such an wavelength selectivity may be produced in the reflective layer by alternately laminating layers of two or more kinds of different materials having different refractive indices to form the reflective layer.

The identification label of the present invention may be conveniently used as means for preventing an unauthorized duplication of an object to which the identification label is affixed. Further, data may be encoded in the geometrical pattern of the reflected light so that the identification label may be used as an information carrier.

According to such a structure, since visible light is not reflected by the light reflecting layer or, in other words, the light reflecting layer is transparent to human eyes, the identification label would not affect the design of the object in any way. Since the position of the identification label cannot be easily visually determined, forgery of the identification label is rendered highly difficult.

BRIEF DESCRIPTION OF THE DRAWINGS

Now the present invention is described in the following with reference to the appended drawings, in which:

FIG. 1 is a perspective view of a card, and an essential part of the structure for identifying the authenticity of the card;

FIG. 2 is a plan view of a light emitting device and a light receiving device;

FIG. 3 is an enlarged sectional view of the identification label; and

FIG. 4 is a graph showing the relationship between the wavelength of the illuminating light and the transmittance of the light reflecting layer.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

FIGS. 1 through 4 show an embodiment of the present invention applied to a magnetic card given here as an example of information storage card. Referring to FIG. 1, a magnetic stripe 2 extends longitudinally on a surface 1a of the card 1. The surface 1a is also provided with an identification label 3 serving as a light reflecting part and having a hologram layer given with a specific reflective directivity as described hereinafter.

Meanwhile, a magnetic head 4 is provided in a reader/writer of the card 1 which opposes the magnetic stripe 2 when the card 1 is conveyed by a conveyer unit not shown in the drawings. Also provided is a light emitting/receiving unit 5 so as to oppose the identification label 3 when the card 1 is conveyed. This light emitting/receiving unit 5 consists of a light emitting device 6 for projecting an illuminating laser light beam upon the identification label 3 on the surface 1a of the card 1, and an annular light receiving device 8 surrounding the light emitting device 6 as illustrated in FIG. 2. The light emitting device 6 directly opposes the identification label 3 when the card 1 is at a certain prescribed position. The light receiving device 8 consists of a multi-section photodiode which is divided into eight sectors 8a through 8h which can individually detect light. This light receiving device 8 is connected to a determination unit 9 which consists of known CPU, memory, I/F and other components for determining the authenticity of the card 1.

As best illustrated in FIG. 3, the identification label 3 comprises a hologram layer 10 consisting of a hologram forming layer 10a and a light reflecting layer 10b disposed under the hologram forming layer 10a, a bonding agent layer 11 for integrally retaining the hologram layer 10 and securely attaching it to the surface la of the card 1, and a protective layer 12 covering the outer surface of the hologram layer 10.

Here, it should be noted that the hologram forming layer 10a is a transparent layer. As shown in Table 1, the light reflecting layer 10b is formed by alternately laminating layers of sodium hexafluoro-aluminate (Na.sub.3 AlF.sub.6) having a relatively small index of refraction and layers of zinc sulphate (ZnS) having a relatively large index of refraction, and, as shown in FIG. 4, has a transmittance of approximately 100% in the range of visible light (380 nm to 700 nm in wavelength) and a transmittance of approximately 0% in the range of infrared light (780 nm or longer in wavelength).

              TABLE 1______________________________________Layer Number   material thickness (nm)______________________________________1              Na.sub.3 AlF.sub.6                   802              ZnS      923              Na.sub.3 AlF.sub.6                   1564              ZnS      875              Na.sub.3 AlF.sub.6                   1496              ZnS      847              Na.sub.3 AlF.sub.6                   1438              ZnS      809              Na.sub.3 AlF.sub.6                   14010             ZnS      8011             Na.sub.3 AlF.sub.6                   14312             ZnS      8413             Na.sub.3 AlF.sub.6                   14914             ZnS      8715             Na.sub.3 AlF.sub.6                   15616             ZnS      9217             Na.sub.3 AlF.sub.6                   80______________________________________

Therefore, this hologram layer 10 is substantially invisible to human eyes, but has such a reflective directivity as to diffract and reflect infrared light projected from a direction opposing the identification label onto a diagonally opposed pair of the sectors 8a through 8h surrounding the light emitting device 6 as illustrated in FIG. 2.

When actually identifying the authenticity of the card 1, the card 1 is conveyed to a position where the light emitting device 6 of the light emitting/receiving unit 5 directly opposes the identification label 3. Then, the illuminating light consisting of infrared light is projected upon the identification label 3. The light diffracted and reflected by the identification label 3 is received by some of the sectors 8a through 8h of the light receiving device 8, and the authenticity of the card 1 is determined according to the pattern of the received light. Therefore, even when a forger obtained this card 1 with a fraudulent intent, since the identification label 3 is not visible to the human eyes and is therefore hard to locate, it would be substantially impossible to forge the card, combined with the difficulty in analyzing the reflective directivity of the hologram and the technical difficulties and the prohibitive cost involved in duplicating the hologram.

Obviously, the present invention is not limited to the above embodiment. For instance, the hologram was designed so that the illuminating light may be diffracted and reflected onto a pair selected from the sectors 8a through 8h of the light receiving device 8, but the hologram may also be designed so that the illuminating light may be diffracted and reflected onto four or more of the sectors 8a through 8h. If desired, it is possible to encode specific data or information in the pattern of the diffracted or reflected light, and to use the identification label as a medium for carrying specific information.

Also, in the above embodiment, the identification label 3 was provided on a magnetic card 1 given as an example of information storage card, but it may be provided on valuable papers such as checks, promissory notes and gift certificates, and commercially sold goods in general. In this case, by covering the card 1 with a mask having an opening at a position corresponding to the location of the identification label 3, it is possible to identify the identification label 3 by using a portable hand scanner or the like.

Although the hologram was used in the above embodiment, similar results can be obtained by using diffraction grating on the identification label 3 which is to be affixed onto the card 1.

As described above, according to the optical identification label for identifying an object of the present invention, since the object carries a light reflecting part including a light reflecting layer which transmits visible light but reflects light other than visible light of a prescribed range of wavelength and is provided with a unique reflective directivity that can be identified with optical identification means, and the visible light is therefore not reflected by the reflective layer or, in other words, the reflective layer is made transparent, the identification label would not affect the design of the object, and the freedom in designing the object is increased. Further, since the location of the identification label cannot be easily determined with human eyes, the forgery of the object is made extremely difficult. Thus, the present invention offers a significant advantage.

Although the present invention has been described in terms of a preferred embodiment thereof, it is obvious to a person skilled in the art that various alterations and modifications are possible without departing from the scope of the present invention which is set forth in the appended claims.

Citas de patentes
Patente citada Fecha de presentación Fecha de publicación Solicitante Título
US3536894 *23 Jul 196527 Oct 1970Jerry E TravioliElectronic credit card acceptor
US4034211 *20 Jun 19755 Jul 1977Ncr CorporationSystem and method for providing a security check on a credit card
US4501439 *28 Sep 198226 Feb 1985Lgz Landis & Gyr Zug AgDocument having a security feature and method of determining the authenticity of the document
US4856857 *26 Sep 198815 Ago 1989Dai Nippon Insatsu Kabushiki KaishaTransparent reflection-type
JP1371383A * Título no disponible
JPS644934A * Título no disponible
JPS61182580A * Título no disponible
Citada por
Patente citante Fecha de presentación Fecha de publicación Solicitante Título
US5401561 *8 Sep 199328 Mar 1995Borus Spezialverfahren Und -Gerate Im Sondermaschinenbau GmbhBasic commodity or collector's object with identification label
US5497227 *16 Ago 19935 Mar 1996Nhk Spring Co., Ltd.System for determining the authenticity of an object
US5621515 *29 Dic 199415 Abr 1997Nhk Spring Co., Ltd.Identification system using regions of predetermined properties interspersed among regions of other properties
US5644412 *4 Feb 19941 Jul 1997Dai Nippon Printing Co., Ltd.Hologram and method of reading the same
US5661703 *21 Mar 199626 Ago 1997Fujitsu LimitedOptical recording medium having a non-volatile identification code and method for encoding data using same
US5735550 *31 May 19967 Abr 1998Hinkle; Michael B.Secure credit card
US5812501 *13 Mar 199722 Sep 1998Fujitsu LimitedOptical recording medium having a non-volatile identification code and method for encoding data using same
US5825475 *29 Jul 199720 Oct 1998Van Leer Metallized Products (Usa) LimitedSystem and method for determining which of a plurality of visually indistinguishable objects have been marked with a covert indicator
US6092728 *12 Jul 199925 Jul 2000Symbol Technologies, Inc.Miniature laser diode focusing module using micro-optics
US6155491 *2 Jun 19985 Dic 2000Welch Allyn Data Collection, Inc.Lottery game ticket processing apparatus
US629013013 Abr 200018 Sep 2001Drexler Technology CorporationAnti-counterfeit authentication method for optical memory cards and hybrid smart cards
US62901371 Oct 199918 Sep 2001Perfect Plastic Printing CorporationTransparent/translucent financial transaction card including an infrared light filter
US629618824 Nov 19992 Oct 2001Perfect Plastic Printing CorporationTransparent/translucent financial transaction card including an infrared light filter
US63046602 Jun 199816 Oct 2001Welch Allyn Data Collection, Inc.Apparatuses for processing security documents
US64059292 Jun 199818 Jun 2002Hand Held Products, Inc.Material detection systems for security documents
US6459514 *18 Oct 19991 Oct 20023M Innovative Properties CompanyMultilayer polymer film with additional coatings or layers
US65818391 Sep 200024 Jun 2003American Express Travel Related Services Company, Inc.Transaction card
US6627250 *9 Jun 200030 Sep 2003Abb Patent GmbhMethod of safeguarding electrical switchgear, in particular, against imitation
US670553010 Ene 200316 Mar 2004Perfect Plastic Printing CorporationTransparent/translucent financial transaction card
US673293629 Sep 200011 May 2004Perfect Plastic Printing Corp.Transparent/translucent financial transaction card
US6737154 *16 Abr 200118 May 20043M Innovative Properties CompanyMultilayer polymer film with additional coatings or layers
US674912331 Ene 200215 Jun 2004American Express Travel Related Services Company, Inc.Transaction card
US67640147 Mar 200220 Jul 2004American Express Travel Related Services Company, Inc.Transaction card
US698646515 Dic 200317 Ene 2006American Express Travel Related Services Company, Inc.Transparent/translucent financial transaction card
US707011210 Mar 20044 Jul 2006American Express Travel Related Services Company, Inc.Transparent transaction device
US709216012 Sep 200315 Ago 2006Illumina, Inc.Method of manufacturing of diffraction grating-based optical identification element
US709376710 Mar 200422 Ago 2006American Express Travel Related Services Company, Inc.System and method for manufacturing a punch-out RFID transaction device
US710651312 Sep 200312 Sep 2006Illumina, Inc.Diffraction grating-based encoded particle
US712675512 Sep 200324 Oct 2006Moon John AMethod and apparatus for labeling using diffraction grating-based encoded optical identification elements
US71563013 Mar 20052 Ene 2007American Express Travel Related Services Company, Inc.Foldable non-traditionally-sized RF transaction card system and method
US716453322 Ene 200416 Ene 2007Cyvera CorporationHybrid random bead/chip based microarray
US719052212 Sep 200313 Mar 2007Cyvera CorporationChemical synthesis using diffraction grating-based encoded optical elements
US727195118 May 200518 Sep 20073M Innovative Properties CompanyCards and laminates incorporating multilayer optical films
US734915812 Sep 200325 Mar 2008Cyvera CorporationDiffraction grating-based encoded micro-particles for multiplexed experiments
US737589016 Jun 200620 May 2008Cyvera CorporationMethod of manufacturing of a diffraction grating-based optical identification element
US737744321 Mar 200327 May 2008American Express Travel Related Services Company, Inc.Transaction card
US739964312 Sep 200315 Jul 2008Cyvera CorporationMethod and apparatus for aligning microbeads in order to interrogate the same
US743312322 Feb 20057 Oct 2008Illumina, Inc.Optical identification element having non-waveguide photosensitive substrate with diffraction grating therein
US74417031 Oct 200428 Oct 2008Illumina, Inc.Optical reader for diffraction grating-based encoded optical identification elements
US750860817 Nov 200524 Mar 2009Illumina, Inc.Lithographically fabricated holographic optical identification element
US760295216 Nov 200513 Oct 2009Illumina, Inc.Scanner having spatial light modulator
US760417316 Nov 200520 Oct 2009Illumina, Inc.Holographically encoded elements for microarray and other tagging labeling applications, and method and apparatus for making and reading the same
US760758313 Oct 200727 Oct 2009American Express Travel Related Services Company, Inc.Clear contactless card
US761981921 Jul 200517 Nov 2009Illumina, Inc.Method and apparatus for drug product tracking using encoded optical identification elements
US762362416 Nov 200624 Nov 2009Illumina, Inc.Method and apparatus for labeling using optical identification elements characterized by X-ray diffraction
US76361932 May 200622 Dic 20093M Innovative Properties CompanyVisible light-transmissive IR filter with distorted portions
US765998330 Nov 20069 Feb 2010Electronics And Telecommunications Resarch InstituteHybrid random bead/chip based microarray
US77057329 Dic 200427 Abr 2010Fred BishopAuthenticating an RF transaction using a transaction counter
US779180223 Jun 20087 Sep 2010Illumina, Inc.Optical identification element having a non-waveguide substrate
US779633323 Sep 200814 Sep 2010Illumina, Inc.Encoded microparticles and a method for fabricating
US782710624 Dic 20032 Nov 2010American Express Travel Related Services Company, Inc.System and method for manufacturing a punch-out RFID transaction device
US783057510 Abr 20079 Nov 2010Illumina, Inc.Optical scanner with improved scan time
US783711617 Jul 200723 Nov 2010American Express Travel Related Services Company, Inc.Transaction card
US78371183 Abr 200923 Nov 2010American Express Travel Related Services Company, Inc.Infrared blocking article
US784356722 Dic 200930 Nov 2010Illumina, Inc.Methods of identifying an analyte and nucleic acid analysis
US787280410 Oct 200618 Ene 2011Illumina, Inc.Encoded particle having a grating with variations in the refractive index
US789873521 Mar 20081 Mar 2011Illumina, Inc.Methods and systems for writing an optical code within or on a fiber substrate
US790083616 Jul 20088 Mar 2011Illumina, Inc.Optical reader system for substrates having an optically readable code
US790163013 Sep 20058 Mar 2011Illumina, Inc.Diffraction grating-based encoded microparticle assay stick
US79232606 Oct 200612 Abr 2011Illumina, Inc.Method of reading encoded particles
US80498938 Nov 20101 Nov 2011Illumina, Inc.Methods of identifying analytes and using encoded particles
US806619021 May 200829 Nov 2011American Express Travel Related Services Company, Inc.Transaction card
US808179216 Nov 200520 Dic 2011Illumina, Inc.Fourier scattering methods for encoding microbeads and methods and apparatus for reading the same
US819178819 Oct 20105 Jun 2012American Express Travel Related Services Company, Inc.Transaction card
US826605627 Sep 201011 Sep 2012American Express Travel Related Services Company, Inc.System and method for manufacturing a punch-out RFID transaction device
US833332526 Ene 201118 Dic 2012Illumina, Inc.Optical reader system for substrates having an optically readable code
US847060520 Mar 200925 Jun 2013Illumina, Inc.Optical reader for reading encoded microparticles
US849805214 Sep 200930 Jul 2013Illumina, Inc.Composition including an item and an encoded optical substrate and a method for identifying an item
US856547523 Sep 201122 Oct 2013Illumina, Inc.Optical system and method for reading encoded microbeads
US86148527 Sep 201024 Dic 2013Illumina, Inc.Elongated microparticles having an optically detectable code configured to at least one of reflect or filter light
Clasificaciones
Clasificación de EE.UU.235/487, 283/86, 283/91, 235/468, 356/71, 235/457, 359/2
Clasificación internacionalG06K19/16, G09F7/00, B42D15/10, G06K19/06, G02B27/42, G03H1/18
Clasificación cooperativaB42D15/105, G06K19/16
Clasificación europeaG06K19/16, B42D15/10D
Eventos legales
FechaCódigoEventoDescripción
9 Sep 2005FPAYFee payment
Year of fee payment: 12
21 Sep 2001FPAYFee payment
Year of fee payment: 8
15 Sep 1997FPAYFee payment
Year of fee payment: 4
27 Ene 1992ASAssignment
Owner name: NHK SPRING CO., LTD.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:HOSHINO, HIDEKAZU;TAKEUCHI, ITUSO;REEL/FRAME:005999/0472
Effective date: 19911225